Device for blowing fire-extinguishing gas into storage bins carrying more or less fine materials



June 1935- M. BETZLER 2,006,258

DEVICE FOR BLOWING FIRE EXTINGUISHING GAS INTO STORAGE 'BINS CARRYINGMORE OR LESS FINE MATERIALS Filed Sept. 24, 1954 Patented June 25, 1935V UNITED STATES PATENT OFFICE Martin Betzler, Neuruppin, Germany,assignor to the firm Minimax A.-G., Berlin, Germany ApplicationSeptember 24, 1934, Serial No. 745,371 In Germany June 6, 1931 3 Claims.

When using any of the heretofore known devices for the introduction offire-extinguishing gases into stored goods by means of a pipe projectinginto the material and provided at its end 6 with lateral exit-openings,an explosion may easily occur owing to the pulverized coal or otherstored material, in a more or less finely divided state, being subjectedto a very strong turbulent action by the extinguishing gas escapingthrough the nozzle-opening with great rapidity.

This disadvantage and danger of the older devices are overcome by thepresent invention, providing a porous hollow body, for instance, aporous tube or pipe surrounding the pipe-end carrying the exit-openings.By means of such a device the extinguishing gas is introduced into thestored material through exceedingly small pores distributed over a largesurface. Owing to the frictional resistance offered by the porous bodyagainst the passage of the extinguishing gas the speed of the latter isreduced to such extent as to destroy nearly completely its turbulenteffect. Furthermore, this porous hollow body having such fine pores asto obstruct the passage of any particles of the coal-dust or othermaterial, prevents also effectively the entrance of any dust into thefeed-piping of the extinguishing gas when there is no pressure therein.Thus it will be unnecessary when employing the object of this invention,to place into the gas feed-piping special throttle-media, such as, forinstance, sealing 7 discs to be destroyed by the pressure of theextinguishing gas when starting the device in operation.

One form of executing this invention is shown in the accompanyingdrawing as applied to a pulverized coal feed-bin.

Fig. 1 shows a sectional elevation of this coal dust bin embodying theinvention,

Fig. 2 is the corresponding plan-view.

Fig. 3 shows a longitudinal sectional view of a device serving forblowing in the extinguishing gas in accordance with this invention on anenlarged scale.

with reference to this drawing: In the lower part of a pulverized coalfeed-bin or container a the devices k, serving for blowing in theextinguishing gas, are arranged in such manner as to project into thecoal-dust within said bin. Each device 7: consists of a pipe 0,connected to a feed-pipe m for the extinguishing gas. This pipe isprovided over its entire length with exitopenings 1 and is secured tothe wall of the feedbin a by a flange d. The end of the pipe 0projecting into the coal-bin a is closed. and terminates in a flange e,overlapping the end of the porous tube is, loosely fitting over theentire inner pipe 0 and forming with the latter a tubular space 1'. Bymeans of a sealing ring a, this porous pipe is forms a tight fit withthe flange d pressed against the latter by the use of a nut h.

The extinguishing gas enters the tubular space 1' through the openings jin the pipe 0. After filling this space 2' completely, the gas poursinto the coal-dust-bin a by filtering through the porous pipe is in afinely distributed form.

This mode of executing the object or the present improvement may be, ofcourse, varied in many ways within the scope of this invention whichconsists in the arrangement or a porous envelope surrounding thefeed-pipe for the extinguishing gas projecting into the storage bin,containing the more or less pulverized material, and preferably of aspace between said feed-pipe and the porous envelope to insure aperfectly uniform distribution of the gas during its entrance into thestorage bin or the pulverized material stored therein, respectively, formaintaining the least possible pressure or speed of the gas so as toavoid all risks of explosions.

What I claim is:

1. In an apparatus for blowing fire-extinguishing gas into material in afinely divided state, a container for said material, a feed pipe for thegas extending into said container in position to be covered by saidmaterial, and a porous envelope surrounding the discharge end of saidfeed pipe for obtaining a distribution 0! the extinguishing gas at lowspeed to prevent any turbulentaction of the finely divided material andconsequent explosions.

2. In an apparatus for blowing fire-extinguishing gas into material in afinely divided state, a container for said material, a feed pipe for thegas extending into said container in position to be covered by saidmaterial, lateral discharge openings in said feed pipe, and a porousenvelope surrounding said feed pipe at said discharge openings forobtaining a distribution of the extinguishing gas at low speed toprevent any turbulent action of the finely divided material.

and consequent explosions.

3. In an apparatus for blowing fire-extinguishing gas into material in afinely divided state, a container for said material, a feed pipe for thegas extending into said container in position to be covered by saidmateriai, lateral discharge openings in said feed pipe, and a secondpipe of porous material surrounding said feed pipe at said dischargeopenings and spaced therefrom for obtaining a distribution of theextinguishing gas at low speed to prevent any turbulent action of thefinely divided material and consequent explosions.

MARTIN BE'IZLER.

